Mold



Dec; 1, 1931. w, ROB'E 1,834,290

MOLD

Filed July 6. 1928 2 Sheets-Sheet 1 I gwue'ntox Dec. 1, 1931. w, 5! 055 1,834,290

MOLD

Filed July 6. 1928 2 Sheets-Sheet 2 Patented Dec. 1, 1931 WALTEN B. ROBE, or mowson, MARYLAND imam Application filed my 6, 1928. se a11a. 9o,m

My invention relates to improvements in molds.

The object "of my invention is to providea mold and chill for moldinghollow'or solid 7, 5 castings having depressions therein provided with means for supporting'the hot chills so thatthey do not come in contact with the green sand, whereby the pattern is not injured by the formation of steam and the accumulation of moisture on the casting is also prevented. Another object of'my' invention is to provide an improved chillmade in sections and so supported that it can expand and'contract under the intense heatto which it is subjected, andyet will not materially affectthe contour of the depressionformed in the cast} 11g. a v o I Arfurther object of my invention is to pro vide a mold of this character in which the drag and cope are, in their usual manner, as-

semble'd with the chills in their proper position so that the desired casting can be molded.

' Astill further object of my invention'is to provide a simple, cheap and effective mold'to accomplish the aboveresults and having certain details of structure and combination of parts hereinafter more fully set forth. j

In the accompanying drawings: j-Jj Figure l is a longitudinal vertical sectional view of a mold showing a hollow casting formed therein.

' Figure 2 isa top plan View ofthe drag.-

. Figure 3 is a bottom plan view of the cast-i ing shown in section, in'Figure 1.

view takenon the line 44: of Figurelfl Figure 5 is atop plan view of one'of the chills; r

Figure 6 is a transverse vertical sectional view of one of the chills taken at right angles to that shown in Figure 41 Figure 7' is, an enlarged sectional view-- Figure 9 is an end elevation ofFigure 8,

Figure l isa transverse vertical sectional PATIENTE oFFicE; f

In the drawings, I have shown improved mold particularly adaptedto cast hol- 10w cylinder heads having depressions therein forming compression chambers, but it will be understood thatthe same mold can be used to mold any form of casting in which it is desired to form hollow depressions. I p Referring now to the drawings, "1 represents the drag which, as shown, is of a hol low box like form, haying arranged the bottom thereof any numberfl of cup shaped members 2, having their upper ends in; a horizontal plane with "the upper end of the drag The cup shape-d members are of any desired' shape according to the shape of the depressions desiredtobe formed in'the cast ing. As shown, theyjare'ofj an elongated tapering form having curved 'e'nds which cor respond with the shape of the ordinary compresjsion chamber in a cylinder head;

r In the drawings, I have shown four of the cup shaped members 2', and therefore, in the illustrationIam showing a cylinder headfor a four cylinder engine,-"butit will beunder;

stood that any desiredfnumber-"of chill's' ca'n be usedva'ccording to the number of cylinders; In assembling the mold for, operation, greensand 3 is placedin the drag around the cup shaped members 2," and leveled off even withthe upper endlofthe cup shaped members and with'the upper end of the d1 a',' The chills 4 are placed upon the upper ends of the cup shaped. members 2, and these chills are of a'contour, exactly the shape ofthe cup shaped members, and therefore the chills do not engage the greensand 3 in the drag. s.

The chills are preferably ma in three a sections' 5f6 and 7, the sectionsj6 and 7 hav ing; oblique contacting surfaces 8 and 9,-and the section 5 having an oblique contacting surface 10 engaging the oblique contacting surfaces 11 of'the sections 6 and 7. -Arranged below the three sectionsof the chills is a plate-12 having three openings 13, 14,-

' and 15 through which the bolts 16, 17 and 18 pass, and these bolts, as shown; are of a diameter less than the openings for a purpose hereinafter more fully described." The bolts are providedwith heads 19 and surthe water jacket of the cylinders.

and said baked sand core is provided adjacent each end with small projections 22 which rest upon the sand 3 in the drag. The

cope 22 is of the usual construction and is.

filled with green sand 23, and has the pattern 24: formed therein to correspondwith the shape of the upper outer face of the cylinder head. The usual gate 25 is employed for pouring the molten metal to the castingand the riser 26 arranged at the opposite end to allow any gases and foreign matter in the mold to pass upwardly therein, whereby a more perfect casting is produced, all of which is well understood and needs no further description. The drag 1 and cope 22 are secured together by means of bolts 28v of the usual form passing through the ears27 and 27 carried by the cope anddrag. In casting acylinder head of the type shown in Figure 1 of the drawings it will be noted that before the parts are assembled as shown in Figure 1 the chills are heated to a very high degree, and as the molten metal is poured through the gate 25 it fills themold, and coming in contact with the highly heatedchills, the chillsare still further heated and the heat will expand the metal thereof, causing the obliquely engaging faces to slightly ride one upon the other against the tension of the spring 20, and thus slightlyincrease the size, but not to any material noticeable degree. After themetal has solidified, the cope is removed and by this timethe chills have slightly cooled so that the springs 20 will draw the sections 5, 6' and 7 back to the position shown in Figures 4,5 and 6 in the drawings, away from the casting, whereby the casting is readily removed, leaving the chills in the position for another molding operation. The, baked sandcore 21 is-then removed from the mold in the usual manner and a cylinder head is produced having the four compression chambers 27, 28, '29 and 30. The projections 22 of the baked sand core are'in the four openings 31,32, 33 and 34-, which areadapted to communicate with Theprojection35 at the end of the casting is for the purpose of connecting the hose to the water circulating system of the engine.

, As heretofore stated, I have shown a mold for molding cylinder heads, but it will be understood that I do notcare to limit myself to the same, as thebroad invention is in supporting the hot chills on the cup shaped members so that they do not engage the green sand of the drag, and thus prevent the formation of any steam or moisture on the casting. Having thus fully described my invention what I claim is 1. A mold comprising a drag, hollow chill supporting members in said drag, and chills resting upon the upper ends of the chill supporting members.

2. A mold comprising a drag, hollow chill supporting members in said drag, and chills of the same contour as the upper ends of the supporting members and resting thereon.

8. A mold comprising a drag, hollow chill supporting members in said drag, and having. their upper ends flush with the upper edge of the drag, and chills resting upon ItJlie upper ends of the chill supporting memers.

4. A mold comprising a drag, hollow chill supporting members in said drag and having their upper ends in a plane with the upper edge of the drag, and the space between the chill. supporting members filled with sand, and chills resting upon the upper ends of the chill supporting members.

5-. A mold comprising a, drag, hollow chi-ll supporting members in said drag; and ex pansible chills resting upon the upper ends of the chill supporting members.

6. A mold comprising a drag, hollow chill supporting members in said drag and having their upper ends in a plane with the up per edge of the drag, and the space between the members filled with green sand, and expansible chills resting upon the upper edge of the chill supportingmembers.

7. A mold comprising a drag, hollow chi-ll supporting members in said drag, and expansible chills of the same contour as the upper endsof the chill supporting members and resting thereon.

8. A mold comprising a drag, hollow chill supporting members in said drag, chills resting upon the upper ends of the chill. sup.- porting members, a baked sand core above the chills, and a cope having a mold formed therein above the baked sand core by a pattern. I

9. A mold comprising a drag, chill supporting members in said drag, the spaces between the chill supporting members filled with green sand, chills supportedby the upper ends of the chill supporting members a baked. sand core resting upon the green sand, and a cope having a mold cavity above the baked sand core formed by a pattern;

10. A mold comprising a drag, hollow chill supporting members insaid drag and spaced apart, and a space between the chill. supporting members filled with green sand, a baked sand core supported by the green sand, and a cope having a mold cavity above the green sand core and formed. by a pattern and supported by the drag.

11. A mold comprising a drag and expansible chills resting upon the upper ends of the chill supporting members and closing the same. 7

12. A mold comprising .a drag, hollow chill supporting members in said drag, and chills of the same contour and size as the upper end of the chill supporting members and resting thereon.

13. A mold comprising a drag, hollow chill supporting members in said drag and having their upper ends flush with the upper edge of the drag and chills of the same contour as the upper ends of the supporting members and resting thereon.

14. A mold comprising a drag, chill supporting members in said drag, spaces be tween the chill supporting members filled with green sand, chills supported by the upper ends of the chill supporting members and of the same contour as the upper ends of the supporting members, a packed sand core resting upon the green sand and a cope resting upon the drag having a mold cavity surrounding the packed sand core.

In testimony whereof, I have signed this specification.

WALTEN B. ROBE. 

